Paul Berry
94862482d2
Change-Id: Ic9075cdbb0aedd17a00d500c44dc33e1516b940b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/300323 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
80 lines
2.7 KiB
Dart
80 lines
2.7 KiB
Dart
// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/// Test that the appropriate errors are generated if a nullable type is used in
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/// an object pattern.
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import 'package:expect/expect.dart';
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typedef A = int?;
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bool nullableWithoutField(x) {
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// This is fine because all the implementation needs to do is a type test.
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switch (x) {
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case A():
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return true;
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default:
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return false;
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}
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}
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bool potentiallyNullableWithoutField<T extends int?>(x) {
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// This is fine because all the implementation needs to do is a type test.
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switch (x) {
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case T():
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return true;
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default:
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return false;
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}
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}
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bool nonNullableTypeArgument<T extends int>(x) {
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// This is fine error because `isEven` *can* be called on `int`.
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switch (x) {
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case T(isEven: true):
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return true;
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default:
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return false;
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}
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}
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bool nullableWithObjectFields(x) {
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// This is fine because the fields `hashCode` and `runtimeType` are defined on
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// `null`.
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switch (x) {
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case A(:var runtimeType, :var hashCode):
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Expect.equals(x.runtimeType, runtimeType);
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Expect.equals(x.hashCode, hashCode);
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return true;
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default:
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return false;
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}
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}
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main() {
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Expect.equals(true, nullableWithoutField(null));
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Expect.equals(true, nullableWithoutField(0));
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Expect.equals(false, nullableWithoutField(''));
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Expect.equals(true, potentiallyNullableWithoutField<int?>(null));
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Expect.equals(true, potentiallyNullableWithoutField<int?>(0));
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Expect.equals(false, potentiallyNullableWithoutField<int?>(''));
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Expect.equals(false, potentiallyNullableWithoutField<int>(null));
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Expect.equals(true, potentiallyNullableWithoutField<int>(0));
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Expect.equals(false, potentiallyNullableWithoutField<int>(''));
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Expect.equals(false, potentiallyNullableWithoutField<Never>(null));
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Expect.equals(false, potentiallyNullableWithoutField<Never>(0));
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Expect.equals(false, potentiallyNullableWithoutField<Never>(''));
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Expect.equals(false, nonNullableTypeArgument<int>(null));
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Expect.equals(true, nonNullableTypeArgument<int>(0));
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Expect.equals(false, nonNullableTypeArgument<int>(1));
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Expect.equals(false, nonNullableTypeArgument<int>(''));
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Expect.equals(false, nonNullableTypeArgument<Never>(null));
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Expect.equals(false, nonNullableTypeArgument<Never>(0));
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Expect.equals(false, nonNullableTypeArgument<Never>(1));
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Expect.equals(false, nonNullableTypeArgument<Never>(''));
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Expect.equals(true, nullableWithObjectFields(null));
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Expect.equals(true, nullableWithObjectFields(0));
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Expect.equals(false, nullableWithObjectFields(''));
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}
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